Paul J Michaels

US Patent:

6356851, Mar 12, 2002

Filed:

Feb 5, 1999

Appl. No.:

09/245260

Inventors:

Kevin I. Young - Troy MI
Joseph F. Supinsky - Shelby Township MI
Paul A. Michaels - Livonia MI

Assignee:

Delphi Technologies, Inc. - Troy MI

International Classification:

G01C 1738

US Classification:

702 92, 33356, 33357, 73 176, 701224

Abstract:

A system for calibrating an electronic compass for a vehicle of the type employing a Forward and Lateral magnetoresistive magnetic field sensor. As the vehicle changes headings, the system periodically samples and digitally stores the peaks of the sensor outputs. When the stored peaks indicate a minimum change in the output of the sensors, the system microcomputer calculates a âboxâ surrounding the subscribed arc of heading changes and computes the center of the âboxâ as the center of the locus of anticipated peaks for all quadrants and shifts the locus (i. e. , âboxâ) to be within the domain of the A/D converter to prevent saturation, which could otherwise occur in the presence of strong remnant magnetic fields in the vehicle. The âboxâ is updated with each sampling of sensor outputs until the vehicle is eventually headed through all four cardinal compass headings, and the compass is then considered to be fully modeled in the microcomputer.

US Patent:

41253744, Nov 14, 1978

Filed:

Nov 21, 1977

Appl. No.:

5/853158

Inventors:

James D. Bode - Royal Oak MI
William G. Wolber - Southfield MI
Paul A. Michaels - Livonia MI
Charles J. Ahern - Lathrup Village MI

Assignee:

Bendix Autolite Corporation - Fostoria OH

International Classification:

G01N 2712

US Classification:

23232E

Abstract:

A wide range combustion mixture air/fuel ratio sensor in which an electrochemical cell supplies hydrogen gas to a palladium sensor element at a rate regulated by the output of a Wheatstone bridge circuit incorporating the sensor element. This generated hydrogen gas combines with any oxygen present in the exhaust gas through catalytic action and also maintains the level of absorbed hydrogen, and therefore the electrical resistance of the palladium sensor element, at a preselected value. The magnitude of the current applied to the electrochemical cell necessary to maintain this balance is a measure of the combustion mixture air/fuel ratio.